As said in previous posts HeliSim have an N2 and 155 Simulators but no N3 simulator. They have however the N2 simulator available with N3 software simulating N3 performance etc. The probplem is that for example Governor Malfunctions for the N3 can not be trained in the Sim.
Check with HeliSim for availability and approvals and check with your CAA if they approved the use of the "upgraded" N2 simulator.